kwin performance gets worse and worse with every release

Nikos Chantziaras realnc at
Thu Jun 30 10:45:54 BST 2011

On 06/30/2011 06:28 AM, Duncan wrote:
> Nikos Chantziaras posted on Wed, 29 Jun 2011 23:22:36 +0300 as excerpted:
>> (I'm using a Radeon HD4870 with the open source drivers.)
>> I was able to find a tweak that makes kwin usable again though.  I had
>> to create a ~/.drirc file and put this in there:
>>     <driconf>
>>       <device screen="0" driver="dri2">
>>           <application name="Default">
>>               <option name="vblank_mode" value="0" />
>>           </application>
>>       </device>
>>     </driconf>
>> The "driconf" utility doesn't work; the above has to be created by hand.
>> Also, the "VSync" option in System Settings must be unchecked.  Both of
>> these things must be performed; if only the .drirc file is created, or
>> only the VSync checkbox is unchecked, then kwin will keep being slow.
>> It should be noted that the desktop is still tear-free after doing the
>> above.
> [...]
> Meanwhile, I'd be interested in your locked and unlocked glxgears
> framerate stats.  If you're seeing<  60 Hz even maximized (assuming
> you're not running dual 2560x1600 monitors or some such), then there's
> gotta be something wrong with your effects chain, somewhere, because as I
> said, AFAIK, your hd4870/rv780 should in theory be getting better stats
> than my hd4650/rv730.

I'm getting about 7000 FPS windowed, and 4000FPS maximized (yes, that's 
thousands, not hundreds.)  But I think glxgears is not pretty good as a 
benchmark these days.

> Next thing to try is OpenGL video playback.  I wonder if the unlocked
> framerate will affect it any...

If you have SwapbuffersWait disabled, then the effect will be ugly 
tearing and higher GPU temps.

This message is from the kde mailing list.
Account management:
More info:

More information about the kde mailing list